Edexcel IGCSE Maths复习笔记 1.6.1 Set Notation & Venn Diagrams

Edexcel IGCSE Maths复习笔记 1.6.1 Set Notation & Venn Diagrams

What do I need to know?

• You’ll be drawing?Venn?diagrams?so make sure you are familiar with those first
• Notation

ξ?is the?universal?set (the set of?everything)

a ∈ B means a?is an?element?of B?(a?is in the set B)

A ∩ B means the?intersection?of A?and B?(the?overlap?of A?and?B)

A ∪ B means the?union?of A?and B?(everything?in A?or?B?or?both)

A' is “not?A” (everything?outside?A)

Sets can be written as a list of?elements?(members) or described in words – either way curly brackets are used:

• • A={3, 6, 9, 12, 15, 18}
  • A={Multiples of 3 less than 20}

Worked Example

Worked Example

转载自savemyexam